不过在大多数情况下不会有太大问题。 像往常一样,上面的示例代码都托管在 GitHub。 欢迎关注知乎专栏《跟上Java8》,分享优秀的Java8中文指南、教程,同时欢迎投稿高质量的文章。 原文:Avoid Null Checks in Java 8 译者:ostatsu 来源:在Java 8 中避免 Null 检查...
原文:https://winterbe.com/posts/2015/03/15/avoid-null-checks-in-java/ 译文:https://www.oschina.net/translate/avoid-null-checks-in-java 原文作者:Benjamin 译文作者:ostatsu
In the real world, programmers find it hard to identify which objects can benull.An aggressively safe strategy could be to checknullfor every object. However, this causes a lot of redundantnullchecks and makes our code less readable. In the next few sections, we’ll go through some of the...
In this example, the String variable str is initialized to null. The if statement checks if str is null and prints a message accordingly. Example 2: Null Check Before Method Call public class NullCheckExample { public static void main(String[] args) { String str = null; if (str != nul...
Lombok @NotNull Annotation is used to generate not null checks that can prevent execution butonly in Runtime.So it doesn't fit our purpose.Shortly, this annotation does the next thing: Checker Framework @NonNull @Nullable Annotations Processors ...
检查是否存在TODO(待处理) TODO是javaIDE自动生成的。一般代码写完后要去掉。 --> <module name="TodoComment"/> <!-- Checks that long constants are defined with an upper ell. That is ' L' and not 'l'. This is in accordance to the Java Language Specification, Section 3.10.1. ...
It simply checks for the null reference of the input String object. If the input object is null, it returns an empty (“”) String, otherwise, it returns the same String: return value == null ? "" : value; However, as we know, String objects are immutable in Java. That means, ...
Before opening an issue,@davidalayachewI recommend changing allthrow new NullPointerException();inConcurrentHashMapto be (Objects static import)requireNonNull, and ensurerequireNonNullare on distinct lines. This way we can deduce the null argument from the line number. What do you think?
java.util.Objects.requireNonNull(Object)/*** Checks that the specified object reference is not {@...
In some cases, it may be appropriate to assign an emptyListinstead of null. This way, you can avoid null checks and simplify your code. List<String>list=getList();List<String>nonNullList=list!=null?list:Collections.emptyList();System.out.println(nonNullList.size()); ...